Air controlling means for carburetors



March 14, 1933. w. A. HEIDE AIR CONTROLLING MEANS FOR CARBURETORS Original Filed April 25, 1928 l atentecl Mar. 14, 1933 l Q UNITED STATES PATENT FFICE WILLIAM A. HEIDE, F DETROIT, MICHIGAN AIR CONTROLLING MEANS FOR GARIBURETORS Original application filed April 25, 1928, Serial N0. 272,739. Divided and this application filed June 10, 1929. Serial No. 369,814.

This invention relates to air controlling Th tubular outlet arm 2 of the carbumeans for carburetors and is more especially retor has a counterbore 7 0 partly surrounded a division of an application filed by me on by a hot a r chamber 71 having ports 72 and April 25, 1928, Serial Number 272,739. (2' to which heated fresh air is supplied It is an object of the invention to provide from any suitable source. A Venturi tube a device of this character utilizing a com- 73 1s slidably mounted in the counterbore, bined Venturi tube and valve for controlling this tube having a stud 74L extending through the admission of air to the outlet of a carthe wall of the counterbore and pivotally bureton engaged by a rod 75 in which is formed a 10 Another object is to provide a means longitudinal slot 7 6. A guide stud 77 exwhereby the said valve will be shifted to cut tends into this slot from the tubular arm off the supply of fresh air when the butterfly The bell crank 78 of the butterfly valve 3 is valve is set in proper position for starting the Connected by a link 80 to the rod 7 5 so that motor, the mechanism being such that as the when the butterfly valve 18 rotated a right 15 butterfly valve is advanced from starting poline movement will be imparted to the Vensition, air is admitted in increasing quantituri tube. Air inlet ports 81 can be formed ti in the wall of the counterbore and so With the foregoing and other objects in located that when the Venturi tube is in one view which will appear as the description extreme position the ports will be closed.

2 proceeds, the invention resides in the combi- However, when the tube is thrust to the right 70 nation and arrangement of parts and in the from the position shown in Figure 2, these details of construction hereinafter described ports will be uncovered and air will be free and claimed, it being understood that changes to enter the device across one end of the Venin the precise embodiment of the invention turi tube.

25 herein disclosed may be made within the scope IV hen the device is in operation, suction 7 of what is claimed without departing from from the cylinder of an internal combustion the spirit of the invention. engine will draw gas of a rich mlxture from In the accompanying drawing the pre the carburetor casing 1 through the tubular ferred form of the invention has been shown. member 2. 30 In said drawing, The drawing shows the device in starting Figure 1 is a side elevation of a carburetor position, wherein it will be observed that the having the present improvement combined butterfly Valve 3 is nearly closed and the therewith. Venturi tube 7 3 is located near to the inner Figure 2 is a longitudinal section through end of the counterbore 70. In this position 5 the combined valve and Venturi tube and adair is prevented from entering the ports 81 85 jacent parts. from the hot air chamber 71 by the Venturi Figure 3 is a section on line 33, Figure 2. tube. Figure 4 is a section on line H, Figure 2. This adjustment supplies a rich mixture Referring to t e figures by characters of of gas to the engine, as is desirable when 40 reference, 1 designates a carburetor casing starting, and asthe butterfly valve is opened having a tubular arm 2 constituting the outfurther the Venturi tube is moved by the rod let thereof. In this arm is provided a but- 7 5 to uncover the air inlet ports 81. In this terfly valve 3 the stem 4 of which is extended position of the device, heated air is admitted outside of the tubular arm 2 and has a crank in a continuous flow through the circumfer- 45 arm 5 adapted to be engaged by an actuating ential ports 81. When the Venturi tube 73 wire 6 which can be operated in the usual or is moved further to the right, as viewed in any preferred manner. Aflange? is located Figure 2, a greater amount of heated air at the outlet end of the tubular arm 2 and is is admitted to mix with the added supply adapted to be secured in the usual way to the of rich gas from the butterfly valve 3, as

50 intake manifold of an engine. engine speed requires. 10o

member It will be noted that this heated air is supplied between the buterfly valve 3 and the Venturi tube 78, permitting an uninterrupted flow of gas from the butterfly valve to the cylinder of the motor.

It will also be noted that no nozzles or other means of deflecting a smooth flow of gas are present in the path of the gas before or after it meets the heated air.

It will further be noted that the rich mixture of gas traverses the tubular member 2 toward the Venturi tube 73, until it meets the circumferentially disposed incoming jets of heated air which will entirely surround the flow of rich mixture to prevent condensation at this point.

This heated air mixes with the rich mixture of gas to reduce it to its predetermined proportions and keeps the temperature of the mixture from falling as the gas is speeded up by the well known Venturi action.

All of the actions just described combine to produce and deliver to the engine cylinder a constant flow of. gas of a combustible temperature and a homogeneous mixture.

\Vhat is claimed is:

1. In a carburetor a tubular member having a passage for the flow of gas of a rich mixture, a counterbore in one end of the member, a butterfly valve spaced from the counterbore, a Venturi tube slidable in the counterbore, inletports in the counterbore circumterentially disposed and longitudinally spaced from one end of the counterbore, lever and link connections between the butterfly valve and the Venturi tube whereby both are adjusted simultaneously, said Venturi tube being movable outwardly of the counterbore to admit air to the counterbore between the butterfly valve and the Venturi tube, for thinning the said rich mixture, and a hot air chamber surrounding a portion of the tubular member adjacent the air inlet ports.

2. In a carburetor a tubular member having a passage for the flow of gas of a rich mixture, a counterbore in one end of the member, a butterfly valve in the member and spaced from the counterbore, a Venturi tube in the counter bore, and circumferential ports in the counterbore for receiving hot air, the Venturi tube being capable of closing said ports in one position and capable of admitting air through the ports to the tubular between the butterfly valve and the Venturi tube inlet during progressive movement of the Venturi tube away from the butterfly valve.

In testimony that I claim the foregoing as my own, I have hereto at'fixed my signature.

WVILLIAM A. HEIDE. 

